Dual-energy X-ray micro-CT imaging of hybrid Ni/Al open-cell foam

Content Provider	Scilit
Author	Fíla, T. Kumpova, Ivana Koudelka, P. Zlamal, Petr Vavrik, Daniel Jiroušek, O. Jung, A.
Copyright Year	2016
Description	Journal: Journal of Instrumentation In this paper, we employ dual-energy X-ray microfocus tomography (DECT) measurement to develop high-resolution finite element (FE) models that can be used for the numerical assessment of the deformation behaviour of hybrid Ni/Al foam subjected to both quasi-static and dynamic compressive loading. Cubic samples of hybrid Ni/Al open-cell foam with an edge length of [15]mm were investigated by the DECT measurement. The material was prepared using $AlSi_{7}Mg_{0.3}$ aluminium foam with a mean pore size of [0.85]mm, coated with nanocrystalline nickel (crystallite size of approx. [50]nm) to form a surface layer with a theoretical thickness of [0.075]mm. CT imaging was carried out using state-of-the-art DSCT/DECT X-ray scanner developed at Centre of Excellence Telč. The device consists of a modular orthogonal assembly of two tube-detector imaging pairs, with an independent geometry setting and shared rotational stage mounted on a complex 16-axis CNC positioning system to enable unprecedented measurement variability for highly-detailed tomographical measurements. A sample of the metal foam was simultaneously irradiated using an XWT-240-SE reflection type X-ray tube and an XWT-160-TCHR transmission type X-ray tube. An enhanced dual-source sampling strategy was used for data acquisition. X-ray images were taken using XRD1622 large area GOS scintillator flat panel detectors with an active area of [410 × 410]mm and resolution [2048 × 2048]pixels. Tomographic scanning was performed in 1,200 projections with a 0.3 degree angular step to improve the accuracy of the generated models due to the very complex microstructure and high attenuation of the investigated material. Reconstructed data was processed using a dual-energy algorithm, and was used for the development of a 3D model and voxel model of the foam. The selected parameters of the models were compared with nominal parameters of the actual foam and showed good correlation.
Related Links	http://iopscience.iop.org/article/10.1088/1748-0221/11/01/C01005/pdf
Ending Page	C01005
Page Count	1
Starting Page	C01005
ISSN	17480221
e-ISSN	17480221
DOI	10.1088/1748-0221/11/01/c01005
Journal	Journal of Instrumentation
Issue Number	1
Volume Number	11
Language	English
Publisher	IOP Publishing
Publisher Date	2016-01-01
Access Restriction	Open
Subject Keyword	Journal: Journal of Instrumentation Characterization and Testing of Materials Dual Energy Ct Imaging
Content Type	Text
Resource Type	Article
Subject	Instrumentation Mathematical Physics